Outline of Chemistry - Atomic Theory

Atomic Theory

The Atomic Model Timeline

  • The idea of what an atom is has changed over time.
  • Different scientists and their discoveries have led to the development of the current model of an atom.
  • Other examples include:
    • The solar system (BIG made SMALL)
    • The biological cell (SMALL made BIG)

The Democritus Model

  • A Greek philosopher
  • He conceived the idea of the atom to describe matter.
  • Atom comes from the word atomos which means "indivisible".
  • He believed that matter was finite (had a limit)
  • He believed the smallest piece of matter was an indestructible and indivisible particle which he called the "atom".

The John Dalton Model

J.J. Thompson: The Plum Pudding Model

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